Oilpan: Move the EventListener hierarchy to Oilpan's heap

Source/core/frame/EventHandlerRegistry.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/frame/EventHandlerRegistry.h"
 
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLFrameOwnerElement.h"
@@ skipping 143 matching lines @@
 void EventHandlerRegistry::didMoveIntoFrameHost(EventTarget& target)
 {
     if (!target.hasEventListeners())
         return;
 
     Vector<AtomicString> eventTypes = target.eventTypes();
     for (size_t i = 0; i < eventTypes.size(); ++i) {
         EventHandlerClass handlerClass;
         if (!eventTypeToClass(eventTypes[i], &handlerClass))
             continue;
-        for (unsigned count = target.getEventListeners(eventTypes[i]).size(); count > 0; --count)
+        EventListenerVector* listeners = target.getEventListeners(eventTypes[i]);
+        if (!listeners)
+            continue;
+        for (unsigned count = listeners->size(); count > 0; --count)
             didAddEventHandler(target, handlerClass);
     }
 }
 
 void EventHandlerRegistry::didMoveOutOfFrameHost(EventTarget& target)
 {
     didRemoveAllEventHandlers(target);
 }
 
 void EventHandlerRegistry::didMoveBetweenFrameHosts(EventTarget& target, FrameHost* oldFrameHost, FrameHost* newFrameHost)
@@ skipping 118 matching lines @@
                 ASSERT(window->frame());
                 ASSERT(window->frame()->host());
                 ASSERT(window->frame()->host() == &m_frameHost);
             }
         }
     }
 #endif // ENABLE(ASSERT)
 }
 
 } // namespace blink